How the Marriage Gap Favors Obama

How the Marriage Gap Favors Obama

Men and women differ in countless ways, from their interest in sports to their views on gun control to how rare they prefer their hamburgers. It's no revelation that there are discrepancies in their voting habits too: Democratic candidates tend to get more support from women voters, Republicans do better among men. This is the vaunted "gender gap,"which has been a staple of presidential campaign coverage for at least three decades.

For some reason the notion took hold early on that this divergence would be a boon for...